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| All Patents in class 241/76 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,117,300 | May 17, 1938 | J. Corser | Rock crushing machine | ore processing apparatus | |
| 2,179,747 | Nov. 14, 1939 | P.C. Malmsten | Means for conveying aggregates in portable rock crusher machines | stone crushers | |
| 2,256,731 | Sep. 23, 1941 | G.C. Winther | Means for forming and segregating rock chips from aggregates | ||